B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
18/680
B29C 45/00 (2006.01) B29C 33/20 (2006.01) B29C 45/67 (2006.01) B30B 1/32 (2006.01) B29C 67/24 (2006.01)
Patent
CA 2011395
ABSTRACT A high tonnage reaction injection molding (RIM) press having fixed and movable platens for clamping a composite mold therebetween at a closed mold position, a plurality of high pressure hydraulic cylinders are mounted on a carrier for the movable platen, and a locking mechanism having a plurality of incrementally spaced locking positions is effective to lock the carrier selectively at said positions, a pair of low power hydraulic piston-cylinder assemblies connected with the carrier adjacent to its opposite ends move the carrier and movable platen to the closed position, short stroke connecting rods operated by the high pressure cylinders are forced independently of each other into high tonnage engagement with the movable platen at a plurality of locations within the area of the composite mold to clamp the latter between the platens and positively seal its junctures, whereupon a RIM mix head injects the high pressure reactive chemicals into the sealed mold, sensor means including a pair of sensors associated with said pair of low power assemblies sense deviations of the opposite ends from a reference plant and cooperate with the associated low power assemblies to maintain the carrier at a predetermined attitude with respect to the plane as the carrier moves to said closed 36,171A-F position, the sensor means also send the distance that the carrier must be moved from the closed position to the next successive locking position, then in sequence, actuate said low pressure assemblies to move the carrier to the next successive locking position, thereby to provide space between the carrier and movable platen, actuate a spacer to span the space and prevent its closure during successive press operations, actuate the high pressure cylinders to clamp the mold between the platens, and finally actuate a RIM mix head to inject the high pressure reactive chemicals into the mold. 36,171A-F
Smart & Biggar
The Dow Chemical Company
Zakich Paul
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